[Shotimes] 3-Digit code question

[jfkoper1@aol.com]

 Hello all,
 
My CE light started glowing solid about on the return trip from the convention.  I pulled the codes using a jumper wire and got the following (KOEO):
 
175      No HEGO switching detected / adaptive fuel at limit (LH).
 176     HEGO sensor indicates system lean (LH).
 
Does this most likely point to a bad O2 sensor on the firewall side of the engine?  I can test the old one and what not, but are there any other items besides O2 sensors to look for?  They were replaced about 70-80K ago. I don't have the codes for the KOER part of the test. 
 
Thanks.
 
Jim Koper
92
166K
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